/***** BEGIN LICENSE BLOCK *****
Version: MPL 1.1/GPL 2.0/LGPL 2.1

The contents of this file are subject to the Mozilla Public License Version 
1.1 (the "License"); you may not use this file except in compliance with 
the License. You may obtain a copy of the License at 
http://www.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
for the specific language governing rights and limitations under the
License.

The Original Code is Tab-in-tab.

The Initial Developer of the Original Code is
Chu Ka Cheong <edwincheese@gmail.com>.
Portions created by the Initial Developer are Copyright (C) 2009
the Initial Developer. All Rights Reserved.

Contributor(s):
yahoo7378@gmail.com,
ycw0518@yahoo.com.hk,
lee__pak__ho@hotmail.com

Tab-in-tab contains source code derived from Tree Style Tab. The Initial
Developer of Tree Style Tab is SHIMODA Hiroshi.

Alternatively, the contents of this file may be used under the terms of
either the GNU General Public License Version 2 or later (the "GPL"), or
the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the MPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the MPL, the GPL or the LGPL.

***** END LICENSE BLOCK *****/

var TabInTabService = {
    NSResolver : {
        lookupNamespaceURI : function(aPrefix)
        {
            switch (aPrefix)
            {
                case 'xul':
                    return 'http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul';
                case 'html':
                case 'xhtml':
                    return 'http://www.w3.org/1999/xhtml';
                case 'xlink':
                    return 'http://www.w3.org/1999/xlink';
                default:
                    return '';
            }
        }
    },

    init : function()
    {
        if (!('gBrowser' in window)) return;
        
        if (this.initialized) return;
        this.initialized = true;

        window.removeEventListener('load', this, false);
        window.addEventListener('unload', this, false);

        this.initTabBrowser(gBrowser);
    },
    initialized : false,

    initTabBrowser : function(aTabBrowser)
    {
        if (aTabBrowser.localName != 'tabbrowser') return;
        aTabBrowser.tabInTab = new TabInTabBrowser(aTabBrowser);
        aTabBrowser.tabInTab.init();
    },

    destroy : function()
    {
        window.removeEventListener('unload', this, false);
    },

    handleEvent : function(aEvent)
    {
        switch (aEvent.type)
        {
            case 'load':
                this.init();
                return;

            case 'unload':
                this.destroy();
                return;
        }
    },

    /* get tab(s). adapted from TreeStyleTab */ 
    
    getTabById : function(aId, aTabBrowserChildren) 
    {
        if (!aId) return null;
        var b = aTabBrowserChildren ? this.getTabBrowserFromChild(aTabBrowserChildren) : null ;
        if (!b) b = this.browser;
        return this.evaluateXPath(
                'descendant::xul:tab[@'+this.kID+' = "'+aId+'"]',
                b.mTabContainer,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getTabs : function(aTabBrowser) 
    {
        return this.evaluateXPath(
                'descendant::xul:tab',
                aTabBrowser.mTabContainer
            );
    },
 
    getTabsArray : function(aTabBrowser) 
    {
        var tabs = this.getTabs(aTabBrowser);
        var array = [];
        for (var i = 0, maxi = tabs.snapshotLength; i < maxi; i++)
        {
            array.push(tabs.snapshotItem(i));
        }
        return array;
    },
 
    getFirstTab : function(aTabBrowser) 
    {
        return this.evaluateXPath(
                'descendant::xul:tab[1]',
                aTabBrowser.mTabContainer,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getLastTab : function(aTabBrowser) 
    {
        return this.evaluateXPath(
                'descendant::xul:tab[last()]',
                aTabBrowser.mTabContainer,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getNextTab : function(aTab) 
    {
        return this.evaluateXPath(
                'following-sibling::xul:tab[1]',
                aTab,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getPreviousTab : function(aTab) 
    {
        return this.evaluateXPath(
                'preceding-sibling::xul:tab[1]',
                aTab,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getNextVisibleTab : function(aTab) 
    {
        return this.evaluateXPath(
                'following-sibling::xul:tab[not(@'+this.kCOLLAPSED+'="true")][1]',
                aTab,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getPreviousVisibleTab : function(aTab) 
    {
        return this.evaluateXPath(
                'preceding-sibling::xul:tab[not(@'+this.kCOLLAPSED+'="true")][1]',
                aTab,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getLastVisibleTab : function(aTab) 
    {
        return this.evaluateXPath(
                'child::xul:tab[not(@'+this.kCOLLAPSED+'="true")][last()]',
                aTab.parentNode,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getVisibleTabs : function(aTab) 
    {
        var xpathResult = this.evaluateXPath(
                'child::xul:tab[not(@'+this.kCOLLAPSED+'="true")]',
                aTab.parentNode
            );
        return xpathResult;
    },
 
    getVisibleIndex : function(aTab) 
    {
        if (aTab.getAttribute(this.kCOLLAPSED) == 'true') return -1;
        return this.evaluateXPath(
                'count(preceding-sibling::xul:tab[not(@'+this.kCOLLAPSED+'="true")])',
                aTab,
                XPathResult.NUMBER_TYPE
            ).numberValue;
    },

    /* tree manipulations. adapted from TreeStyleTab */ 
    
    get rootTabs() 
    {
        return this.getArrayFromXPathResult(
                this.evaluateXPath(
                    'child::xul:tab[not(@'+this.kNEST+') or @'+this.kNEST+'="0" or @'+this.kNEST+'=""]',
                    this.browser.mTabContainer
                )
            );
    },
 
    getParentTab : function(aTab) 
    {
        if (!aTab) return null;
        var id = aTab.getAttribute(this.kID);
        if (!id) return null; // not initialized yet
        return this.evaluateXPath(
                'parent::*/child::xul:tab[contains(concat("|", @'+this.kCHILDREN+', "|"), "|'+id+'|")]',
                aTab,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getRootTab : function(aTab) 
    {
        var parent = aTab;
        var root   = aTab;
        while (parent = this.getParentTab(parent))
        {
            root = parent;
        }
        return root;
    },
 
    getNextSiblingTab : function(aTab) 
    {
        if (!aTab) return null;

        var parentTab = this.getParentTab(aTab);

        if (!parentTab) {
            var next = aTab;
            do {
                next = next.nextSibling;
            }
            while (next &&
                    next.nodeType == Node.ELEMENT_NODE &&
                    this.getParentTab(next));
            return next;
        }

        var children = parentTab.getAttribute(this.kCHILDREN);
        if (children) {
            var list = ('|'+children).split('|'+aTab.getAttribute(this.kID))[1].split('|');
            for (var i = 0, maxi = list.length; i < maxi; i++)
            {
                var firstChild = this.getTabById(list[i], aTab);
                if (firstChild) return firstChild;
            }
        }
        return null;
    },
 
    getPreviousSiblingTab : function(aTab) 
    {
        if (!aTab) return null;

        var parentTab = this.getParentTab(aTab);

        if (!parentTab) {
            var prev = aTab;
            do {
                prev = prev.previousSibling;
            }
            while (prev &&
                    prev.nodeType == Node.ELEMENT_NODE &&
                    this.getParentTab(prev));
            return prev;
        }

        var children = parentTab.getAttribute(this.kCHILDREN);
        if (children) {
            var list = ('|'+children).split('|'+aTab.getAttribute(this.kID))[0].split('|');
            for (var i = list.length-1; i > -1; i--)
            {
                var lastChild = this.getTabById(list[i], aTab);
                if (lastChild) return lastChild;
            }
        }
        return null;
    },
 
    getChildTabs : function(aTab, aAllTabsArray) 
    {
        var tabs = [];
        if (!aTab) return null;

        var children = aTab.getAttribute(this.kCHILDREN);
        if (!children) return tabs;

        if (aAllTabsArray) tabs = aAllTabsArray;

        var list = children.split('|');
        var tab;
        for (var i = 0, maxi = list.length; i < maxi; i++)
        {
            tab = this.getTabById(list[i], aTab);
            if (!tab) continue;
            tabs.push(tab);
            if (aAllTabsArray)
                this.getChildTabs(tab, tabs);
        }

        return tabs;
    },
 
    hasChildTabs : function(aTab) 
    {
        if (!aTab) return false;
        return aTab.hasAttribute(this.kCHILDREN);
    },
 
    getDescendantTabs : function(aTab) 
    {
        var tabs = [];
        this.getChildTabs(aTab, tabs);
        return tabs;
    },
 
    getFirstChildTab : function(aTab) 
    {
        if (!aTab) return null;

        var children   = aTab.getAttribute(this.kCHILDREN);
        var firstChild = null;
        if (children) {
            var list = children.split('|');
            for (var i = 0, maxi = list.length; i < maxi; i++)
            {
                firstChild = this.getTabById(list[i], aTab);
                if (firstChild) break;
            }
        }
        return firstChild;
    },
 
    getLastChildTab : function(aTab) 
    {
        if (!aTab) return null;

        var children  = aTab.getAttribute(this.kCHILDREN);
        var lastChild = null;
        if (children) {
            var list = children.split('|');
            for (var i = list.length-1; i > -1; i--)
            {
                lastChild = this.getTabById(list[i], aTab);
                if (lastChild) break;
            }
        }
        return lastChild;
    },
 
    getLastDescendantTab : function(aTab) 
    {
        if (!aTab) return null;

        var tabs = this.getDescendantTabs(aTab);
        return tabs.length ? tabs[tabs.length-1] : null ;
    },
 
    getChildIndex : function(aTab, aParent) 
    {
        var parent = this.getParentTab(aTab);
        if (!aParent || !parent || aParent != parent) {
            parent = aTab;
            while (parent && parent != aParent)
            {
                aTab = parent;
                parent = this.getParentTab(parent);
            }
            if (parent != aParent)
                return -1;
            aParent = parent;
        }

        if (aParent) {
            var children = aParent.getAttribute(this.kCHILDREN);
            var list = children.split('|');
            var id = aTab.getAttribute(this.kID);
            for (var i = 0, maxi = list.length; i < maxi; i++)
            {
                if (list[i] == id) return i;
            }
            return -1;
        }
        else {
            var tabs = this.rootTabs;
            for (var i = 0, maxi = tabs.length; i < maxi; i++)
            {
                if (tabs[i] == aTab) return i;
            }
        }
    },
 
    getXOffsetOfTab : function(aTab) 
    {
        return this.evaluateXPath(
            'sum((self::* | preceding-sibling::xul:tab[not(@'+this.kCOLLAPSED+'="true")])/attribute::'+this.kX_OFFSET+')',
            aTab,
            XPathResult.NUMBER_TYPE
        ).numberValue;
    },
    getYOffsetOfTab : function(aTab)
    {
        return this.evaluateXPath(
            'sum((self::* | preceding-sibling::xul:tab[not(@'+this.kCOLLAPSED+'="true")])/attribute::'+this.kY_OFFSET+')',
            aTab,
            XPathResult.NUMBER_TYPE
        ).numberValue;
    },

    /* Utilities. adapted from TreeStyleTab */ 
    
    isEventFiredOnTwisty : function(aEvent) 
    {
        var tab = this.getTabFromEvent(aEvent);
        if (!tab) return false;

        return this.hasChildTabs(tab) && this.evaluateXPath(
                'ancestor-or-self::*[@class="'+this.kTWISTY+'" or (ancestor::xul:tabbrowser[@'+this.kMODE+'="vertical"] and @class="tab-icon")]',
                aEvent.originalTarget || aEvent.target,
                XPathResult.BOOLEAN_TYPE
            ).booleanValue;
    },
 
    isEventFiredOnClickable : function(aEvent) 
    {
        return this.evaluateXPath(
                'ancestor-or-self::*[contains(" button toolbarbutton scrollbar popup menupopup tooltip ", concat(" ", local-name(), " "))]',
                aEvent.originalTarget,
                XPathResult.BOOLEAN_TYPE
            ).booleanValue;
    },
 
    isAccelKeyPressed : function(aEvent) 
    {
        return navigator.platform.toLowerCase().indexOf('mac') > -1 ?
            (aEvent.metaKey || (aEvent.keyCode == Components.interfaces.nsIDOMKeyEvent.DOM_VK_META)) :
            (aEvent.ctrlKey || (aEvent.keyCode == Components.interfaces.nsIDOMKeyEvent.DOM_VK_CONTROL)) ;
    },
 
    get browserWindow() 
    {
        return this.WindowMediator.getMostRecentWindow('navigator:browser');
    },
 
    get browser() 
    {
        var w = this.browserWindow;
        return !w ? null :
            'SplitBrowser' in w ? w.SplitBrowser.activeBrowser :
            w.gBrowser ;
    },
 
    evaluateXPath : function(aExpression, aContext, aType) 
    {
        if (!aType) aType = XPathResult.ORDERED_NODE_SNAPSHOT_TYPE;
        try {
            var xpathResult = (aContext.ownerDocument || aContext || document).evaluate(
                    aExpression,
                    (aContext || document),
                    this.NSResolver,
                    aType,
                    null
                );
        }
        catch(e) {
            return {
                singleNodeValue : null,
                snapshotLength  : 0,
                snapshotItem    : function() {
                    return null
                }
            };
        }
        return xpathResult;
    },
 
    getArrayFromXPathResult : function(aXPathResult) 
    {
        var max = aXPathResult.snapshotLength;
        var array = new Array(max);
        if (!max) return array;

        for (var i = 0; i < max; i++)
        {
            array[i] = aXPathResult.snapshotItem(i);
        }

        return array;
    },
 
    getBoxObjectFor : function(aNode) 
    {
        return window['piro.sakura.ne.jp'].boxObject.getBoxObjectFor(aNode);
    },
 
    getTabFromEvent : function(aEvent) 
    {
        return this.getTabFromChild(aEvent.originalTarget || aEvent.target);
    },
 
    getTabFromFrame : function(aFrame, aTabBrowser) 
    {
        var b = aTabBrowser || this.browser;
        var docShell = aFrame.top
            .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
            .getInterface(Components.interfaces.nsIWebNavigation)
            .QueryInterface(Components.interfaces.nsIDocShell);
        var tabs = this.getTabs(b);
        var tab;
        for (var i = 0, maxi = tabs.snapshotLength; i < maxi; i++)
        {
            tab = tabs.snapshotItem(i);
            if (tab.linkedBrowser.docShell == docShell)
                return tab;
        }
        return null;
    },
 
    getTabFromChild : function(aTab) 
    {
        return this.evaluateXPath(
        //        'ancestor-or-self::xul:tab[ancestor::xul:tabbrowser]',
                'ancestor-or-self::xul:tab[ancestor::xul:tabbox]',
                aTab,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getTabBrowserFromChild : function(aTab) 
    {
        if (!aTab) return null;

        if (aTab.__treestyletab__linkedTabBrowser)
            return aTab.__treestyletab__linkedTabBrowser;

        return this.evaluateXPath(
                'ancestor-or-self::xul:tabbrowser',
                aTab,
                XPathResult.FIRST_ORDERED_NODE_TYPE
            ).singleNodeValue;
    },
 
    getTabBrowserFromFrame : function(aFrame) 
    {
        var w = this.browserWindow;
        return !w ? null :
            ('SplitBrowser' in w) ? this.getTabBrowserFromChild(w.SplitBrowser.getSubBrowserAndBrowserFromFrame(aFrame.top).browser) :
            this.browser ;
    },
 
    getFrameFromTabBrowserElements : function(aFrameOrTabBrowser) 
    {
        var frame = aFrameOrTabBrowser;
        if (frame == '[object XULElement]') {
            if (frame.localName == 'tab') {
                frame = frame.linkedBrowser.contentWindow;
            }
            else if (frame.localName == 'browser') {
                frame = frame.contentWindow;
            }
            else {
                frame = this.getTabBrowserFromChild(frame);
                if (!frame) return null;
                frame = frame.contentWindow;
            }
        }
        if (!frame)
            frame = this.browser.contentWindow;

        return frame;
    },
 
    makeNewId : function() 
    {
        return 'tab-<'+Date.now()+'-'+parseInt(Math.random() * 65000)+'>';
    },
 
    makeURIFromSpec : function(aURI) 
    {
        var newURI;
        aURI = aURI || '';
        if (aURI && String(aURI).indexOf('file:') == 0) {
            var fileHandler = this.IOService.getProtocolHandler('file').QueryInterface(Components.interfaces.nsIFileProtocolHandler);
            var tempLocalFile = fileHandler.getFileFromURLSpec(aURI);
            newURI = this.IOService.newFileURI(tempLocalFile);
        }
        else {
            newURI = this.IOService.newURI(aURI, null, null);
        }
        return newURI;
    },
 
    getPropertyPixelValue : function(aElementOrStyle, aProp) 
    {
        var style = aElementOrStyle instanceof Components.interfaces.nsIDOMCSSStyleDeclaration ?
                    aElementOrStyle :
                    window.getComputedStyle(aElementOrStyle, null) ;
        return Number(style.getPropertyValue(aProp).replace(/px$/, ''));
    },

    /* get previews adapted from TabPreview */ 
    
    updatePreview: function(win, size) {
        var w = win.innerWidth;
        var h = win.innerHeight;
        var canvas = document.getElementById("tabpreviewcanvas");

        var canvasW = size.w;
        var canvasH = size.h - 5;
        // set the preview initially for top left
        var xScroll = 0;
        var yScroll = 0;
        var fudge = 0;
    
        canvas.style.width = canvasW+"px";
        canvas.style.height = canvasH+"px";
        canvas.width = canvasW;
        canvas.height = canvasH;
        try {
          var ctx = canvas.getContext("2d");
          ctx.clearRect(0, 0, canvasW, canvasH);
          ctx.save();
          ctx.scale(canvasW/w, canvasH/h);
          ctx.drawWindow(win, xScroll, yScroll, w, h+fudge, "rgb(255,255,255)");
          ctx.restore();
        } catch(e) {
            dump('Error: ' + e.message + '\n');
        }
    },
  
    getPreviewSize: function(width, win) {
        var scale, useHeight;
        var useWidth = width;
        scale = win.innerHeight / win.innerWidth;
        useHeight = useWidth * scale;
        return { w: useWidth, h: useHeight };
    },
}

window.addEventListener('load', TabInTabService, false);
